/Engine/Source/Developer/DesktopPlatform/Public/IDesktopPlatform.h
Opens the "save file" dialog for the platform
true if files were successfully selected
bool SaveFileDialog ( const void * ParentWindowHandle, const [FString](API\Runtime\Core\Containers\FString) & DialogTitle, const [FString](API\Runtime\Core\Containers\FString) & DefaultPath, const [FString](API\Runtime\Core\Containers\FString) & DefaultFile, const [FString](API\Runtime\Core\Containers\FString) & FileTypes, uint32 Flags, [TArray](API\Runtime\Core\Containers\TArray)< [FString](API\Runtime\Core\Containers\FString) > & OutFilenames )